This time's recommendation thanks to psyduck is the manga: Gurenki - Creo the Crimson CrisesBy Takewakamaru.

The plot: Suou is a school girl that enjoys the simple life with her best friend. She has strange dreams involving a red-haired woman. Well that woman happens to be a demon, who soon makes her appearance in front of her and claims that Suou is her property. But there more than meets the eye...

SADLY this manga has been on hiatus for a while now. I have no information to when it will be continued but even so, it is a title that you should read. Let me correct that, this is a manga you MUST read. :3

It really is an amazing manga (at least to me). It's like Clamp and Yuri made a fussion and this is the result.The character design it's really awesome, it goes from your cute girl and friend to the sexiest demon you might have crossed in your life. The art in general is marvelous, full of details you can get lost sometimes, which I don't mind by the way, there's something new for you to discover everytime you read it.If HUGE boobs are a problem for you, then you might be a bit discouraged with the demon girl...

What has been published so far is simply great. The twists the story is taking, all what has yet to be explained, the drama, the action, the mystery, it just draws you in.We have been delighted with some yuri on it that is not that smutty, but it may also be considered NSFW. It has been well balanced.

All the volumes that had been published are translated, but remember if you want to support the yuri authors, try to purchase their works. Go and read some yuri goodness!